(loosely) A contradiction in terms. Historically, an oxymoron was a paradox with a point, where the contradiction seems absurd at first glance, and yet is deliberate, its purpose being to underscore a point or to draw attention to a concealed point.
By far the most massive planet in our solar system, Jupiter features giant hurricanes, auroras, abstract artistic cloudswirls, and maybe even a solid core. It also protects Earth by gravitationally clearing the solar system of asteroids and comets.
There's likely a core that's solid, near the center of the planet...but otherwise no, there's not really a surface. No material we could possibly make on Earth could withstand the pressures and temperatures to land a spacecraft way down there. There is quite a bit of liquid metallic hydrogen in Jupiter's interior.